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Infrared image of zebra

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Infrared image of penguins

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Infrared image of spider

These are the animals of London Zoo seen through the lens of a thermal imaging camera.

The striking pictures look like works of art but in fact provide a fascinating insight into how the creatures use fur and feathers to conserve heat.

They were taken by amateur photographer Steve Lowe using a FLIR civilian thermal-imaging camera.

The red areas are the hottest, followed by orange and yellow, while the blue and green areas are the coolest. Images of Lucifer the lion show how well his mane keeps him warm. It is dark blue - in contrast to the rest of his body - because its insulating properties keep the heat in.

A pelican has clearly been sitting on his feet which are glowing, and he has left a little trail of warm footprints behind him. Red-headed penguins are losing most heat through their heads.

Zoological director David Field said: "While these amazing pictures may be more reminiscent of something from the Tate Modern, they give us a unique perspective on how animals regulate their body temperatures."